To compare/transform someone to one of Dr. Suess' many characters, such as: the cat in the hat, horton, or the grinch.
Guy 1: "Man if you don't be careful I will seussify you!"
Guy 2: "I was just kidding man!"
Guy 1: "That's it! I officially seussify you to the grinch!"
Guy 2: "NOOOOOOOOOO!"